private void DrawValues(SKRect rect, SKCanvas canvas)
{
if (BarValues != null && BarValues.Count <= 0)
{
return;
}
var delta = rect.Width / (BarValues.Count);
_foregroundPaint.StrokeWidth = delta / 1.5f;
var xStart = delta / 2f;
// draw start and end line
if (ShowFirstAndLastLines)
{
var yTop = rect.Height + 1;
var yBottom = rect.Height + _yMargin;
var LeftTop = new SKPoint(xStart, yTop);
var LeftBottom = new SKPoint(xStart, yBottom);
var RightTop = new SKPoint(rect.Right - xStart, yTop);
var RightBottom = new SKPoint(rect.Right - xStart, yBottom);
canvas.DrawLine(LeftTop, LeftBottom, _backgroundPaint);
canvas.DrawLine(RightTop, RightBottom, _backgroundPaint);
}
canvas.ClipRect(rect);
// draw bars
for (var i = 0; i < BarValues.Count; i++)
{
if (BarValues.GetItem(i) is WalkingDayModel data)
{
var xPos = xStart + i * delta;
var normalizedValue = data.MinutesBriskWalking / TotalY;
var yTop = rect.Height - (rect.Height * normalizedValue) + (_foregroundPaint.StrokeWidth / 2f);
var yBottom = rect.Height + _foregroundPaint.StrokeWidth / 2f;
var bottom = new SKPoint(xPos, yBottom);
var top = new SKPoint(xPos, yTop);
canvas.DrawLine(bottom, top, _foregroundPaint);
}
}
}
private void drawBars(DrawingContext drawingContext)
{
if (BarValues == null)
{
return;
}
var barWidth = BarSize.TotalMilliseconds * xValuePrMs / 2;
var barWidthHalf = barWidth / 2;
var barLeft = leftTime - (BarSize);
foreach (var barValue in BarValues.Where(x => x.Item1 >= barLeft && x.Item1 <= rightTime + BarSize))
{
var x = getX(barValue.Item1);
var y = getY(barValue.Item2);
var leftEdge = x - barWidthHalf;
var rightEdge = x + barWidthHalf;
if (rightEdge <= LeftMargin)
{
// Out of bound, skip
continue;
}
if (leftEdge <= LeftMargin)
{
var tempBarWidth = Math.Max(1, barWidth - (LeftMargin - leftEdge));
drawBar(drawingContext,
barValue.Item1.ToString(timeTextFormat),
new Point(x, y),
tempBarWidth,
new Point(LeftMargin, y),
barValue.Item2);
}
else
{
drawBar(drawingContext,
barValue.Item1.ToString(timeTextFormat),
new Point(x, y),
Math.Max(0, barWidth),
new Point(x - barWidth / 2, y),
barValue.Item2);
}
}
}
private Tuple <double, double> getGraphBound()
{
double min = int.MaxValue;
double max = int.MinValue;
if (ReadingBoundMin != null)
{
min = (double)ReadingBoundMin;
}
if (ReadingBoundMax != null)
{
max = (double)ReadingBoundMax;
}
if (ReadingBoundMin == null || ReadingBoundMax == null)
{
if ((BarValues == null || BarValues.Count == 0) &&
(LineValues == null || LineValues.Count == 0))
{
return(new Tuple <double, double>(0, 150));
}
List <Tuple <DateTime, double> > values = new List <Tuple <DateTime, double> >();
if (BarValues == null)
{
values.AddRange(LineValues);
}
else if (LineValues == null)
{
values.AddRange(BarValues);
}
else
{
values.AddRange(BarValues.Union(LineValues));
}
foreach (var source in values)
{
if (ReadingBoundMin == null && source.Item2 < min)
{
min = source.Item2;
}
if (ReadingBoundMax == null && source.Item2 > max)
{
max = source.Item2;
}
}
}
if (Math.Abs(max - min) < 10)
{
return(new Tuple <double, double>(Math.Max(60, min - 10), Math.Min(150, max + 10)));
}
if (min > ReadingLimit)
{
min = ReadingLimit - 10;
}
if (max < ReadingLimit)
{
max = ReadingLimit;
}
return(new Tuple <double, double>(min, max));
}
